IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Limnological characteristics and trophic state of an inland reservoir in Argentina
Autor/es:
FERNÁNDEZ, C; PARODI, E. R; CÁCERES, E. J.
Revista:
LAKES & RESERVOIRS RESEARCH AND MANAGEMENT
Editorial:
Blackwell Publishing
Referencias:
Lugar: Melbourne, Australia; Año: 2009 vol. 14 p. 85 - 101
ISSN:
1320-5331
Resumen:
The current trophic status of Paso de las Piedras Reservoir was evaluated by analysing different physicochemical, biological
and environmental variables, in relation to its water quality, and application of two different classification criteria. Water
quality sampling was conducted at four sampling sites from June 2004 to June 2005. During this study, 183 phytoplankton
taxa were identified. The phytoplankton abundance exhibited a maximum of 368.037 × 103 cells.mL1 in February 2005, and
at least 1.133 × 103 cells.mL1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
at least 1.133 × 103 cells.mL1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
at least 1.133 × 103 cells.mL1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
× 103 cells.mL1 in February 2005, and
at least 1.133 × 103 cells.mL1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans
× 103 cells.mL1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between
December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natansAnabaena circinalis and Microcystis natans
which, together with other companions, were the reason for an algal bloom characterized by an average density of
133.05 × 103 cells.mL1, and an average chlorophyll concentration of 28.7 mg.m3. These study results indicate that the
seasonal variations of physical, chemical and biological parameters in the waters of this reservoir were essentially a
consequence of environmental and hydrological conditions in the dam area. In contrast, the spatial variations inside the lake
were the result of the characteristics of the water inflow provided by its two main tributaries. The N:P ratio suggests neither
nutrient is a limiting factor for maximum algal biomass in the lake, indicating that variations in the phytoplankton
community structure, and development of phytoplankton blooms, would be more constrained by environmental and
hydrological conditions than nutrient competition. The high concentration of measured nutrients could be attributed to the
concurrence of various non-point sources. The phytoplankton species richness was high, exhibiting values even higher than
those mentioned in previous studies. Considering the two trophic classification systems, and based on total phosphorus
data, the reservoir is classified within the hypertrophic category. In contrast, considering only the chlorophyll and turbidity
data, the lake would be classified within the eutrophic category.
seasonal variations of physical, chemical and biological parameters in the waters of this reservoir were essentially a
consequence of environmental and hydrological conditions in the dam area. In contrast, the spatial variations inside the lake
were the result of the characteristics of the water inflow provided by its two main tributaries. The N:P ratio suggests neither
nutrient is a limiting factor for maximum algal biomass in the lake, indicating that variations in the phytoplankton
community structure, and development of phytoplankton blooms, would be more constrained by environmental and
hydrological conditions than nutrient competition. The high concentration of measured nutrients could be attributed to the
concurrence of various non-point sources. The phytoplankton species richness was high, exhibiting values even higher than
those mentioned in previous studies. Considering the two trophic classification systems, and based on total phosphorus
data, the reservoir is classified within the hypertrophic category. In contrast, considering only the chlorophyll and turbidity
data, the lake would be classified within the eutrophic category.
seasonal variations of physical, chemical and biological parameters in the waters of this reservoir were essentially a
consequence of environmental and hydrological conditions in the dam area. In contrast, the spatial variations inside the lake
were the result of the characteristics of the water inflow provided by its two main tributaries. The N:P ratio suggests neither
nutrient is a limiting factor for maximum algal biomass in the lake, indicating that variations in the phytoplankton
community structure, and development of phytoplankton blooms, would be more constrained by environmental and
hydrological conditions than nutrient competition. The high concentration of measured nutrients could be attributed to the
concurrence of various non-point sources. The phytoplankton species richness was high, exhibiting values even higher than
those mentioned in previous studies. Considering the two trophic classification systems, and based on total phosphorus
data, the reservoir is classified within the hypertrophic category. In contrast, considering only the chlorophyll and turbidity
data, the lake would be classified within the eutrophic category.
× 103 cells.mL1, and an average chlorophyll concentration of 28.7 mg.m3. These study results indicate that the
seasonal variations of physical, chemical and biological parameters in the waters of this reservoir were essentially a
consequence of environmental and hydrological conditions in the dam area. In contrast, the spatial variations inside the lake
were the result of the characteristics of the water inflow provided by its two main tributaries. The N:P ratio suggests neither
nutrient is a limiting factor for maximum algal biomass in the lake, indicating that variations in the phytoplankton
community structure, and development of phytoplankton blooms, would be more constrained by environmental and
hydrological conditions than nutrient competition. The high concentration of measured nutrients could be attributed to the
concurrence of various non-point sources. The phytoplankton species richness was high, exhibiting values even higher than
those mentioned in previous studies. Considering the two trophic classification systems, and based on total phosphorus
data, the reservoir is classified within the hypertrophic category. In contrast, considering only the chlorophyll and turbidity
data, the lake would be classified within the eutrophic category.